Reflector for searchlights



Jan. 10, 1939. R mfg- I 2,143,435

REFLECTOR FOR SEARCHLIGHTS Filed July 1, 1956 F mh @chwdDEehigk IN VE N O Q r, W

-29 AWN.

Patented Jan. 10, 1939 UNITED STATES PATENT OFFICE REFLECTOR FOR SEARCHLIGHTS Application July 1, 1936, Serial No. 88,349

In Germany March 4, 1935 1 Claim.

The present invention relates to searchlights and has for its object to provide a searchlight in which a substantial space-angle of the light emitted from a lamp is utilized by means of a suitably designed reflector, while the undesirable enlargement of the filament image is practically avoided and a high concentration of light is obtained. Another object of the invention is to produce a searchlight of the type described,

comprising a parallelizing lens of relatively small dimensions.

According to the present invention, the abovementioned objects are accomplished by the arrangement and combination of elements described in the following description, claimed in the appended claim and illustratively exemplified in the accompanying drawing, the single figure of which is a view in axial section of a reflector composed of an ellipsoid part and a paraboloid part,

In the drawing, I denotes a paraboloid forward reflector portion open at both ends, whilst 2 indicates a concave ellipsoid rear portion having a single focus within the reflector and pro- J'ecting forwardly beyond a vertical plane through said focus. The forward portion I has a focus coinciding with the inner focus of the rear portion 2 and a focal distance less than that of the latter. The rear opening of the forward reflector portion I and the forward opening of the rear reflector portion 2 have the same diameter and the curvatures of the portions are selected in such a manner that the Openings. are disposed adjacent one another. The portions: I and 2 are detachably connected with each other by (Cl. Mil-41.3)

means of cylindrical sleeves 1 provided on the open ends of the portions I and 2 facing one another. The part 2 serves as holder for an incandescent lamp 6, the filament of which is disposed in the common focus 3 of both portions. Rays emitted from the lamp 6, which strike the paraboloid part I are parallelized and then pass through the transparent cover disc 4 provided with grooves 5. Within the range of the rays reflected by the ellipsoid part 2 the cover disc 10 4 is formed as a dispersing lens 8 in such a manner that the rays directed to the point of convergence of the ellipsoid part 2 are substantially parallelized.

What I claim is: 15

In a Searchlight, a reflector comprising a concave forwardly open ellipsoidal rear portion having a single focus within the reflector andprojecting forwardly beyond a vertical plane through said focus, and a paraboloidal forward 20 portion open at both ends, said forward portion having a focus coinciding with the focus of said rear portion and a, focal distance less than that of the latter, a lamp arranged in said common focus of both reflector portions, and a parallel- 25 izing lens disposed in the center of the forward opening of the forward reflector portion within the range of the rays reflected from said ellipsoidal portion, the rear opening of the forward reflector portion and the forward opening of the rear reflector portion having the same diameter and the curvatures of said portions being selected in such a manner, that said openings are disposed adjacent each other.

FRIEDRICH RICHARD DIETRICH. 

